src/gallium/drivers/llvmpipe/lp_state_derived.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 #include "util/u_math.h"
  29 #include "util/u_memory.h"
  30 #include "pipe/p_shader_tokens.h"
  31 #include "draw/draw_context.h"
  32 #include "draw/draw_vertex.h"
  33 #include "draw/draw_private.h"
  34 #include "lp_context.h"
  35 #include "lp_screen.h"
  36 #include "lp_setup.h"
  37 #include "lp_state.h"
  38
  39
  40
  41 /**
  42  * The vertex info describes how to convert the post-transformed vertices
  43  * (simple float[][4]) used by the 'draw' module into vertices for
  44  * rasterization.
  45  *
  46  * This function validates the vertex layout.
  47  */
  48 static void
  49 compute_vertex_info(struct llvmpipe_context *llvmpipe)
  50 {
  51    const struct lp_fragment_shader *lpfs = llvmpipe->fs;
  52    struct vertex_info *vinfo = &llvmpipe->vertex_info;
  53    struct lp_shader_input *inputs = llvmpipe->inputs;
  54    unsigned vs_index;
  55    uint i;
  56
  57    /*
  58     * Match FS inputs against VS outputs, emitting the necessary attributes.
  59     */
  60
  61    vinfo->num_attribs = 0;
  62
  63    vs_index = draw_find_shader_output(llvmpipe->draw,
  64                                        TGSI_SEMANTIC_POSITION,
  65                                        0);
  66
  67    draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_PERSPECTIVE, vs_index);
  68
  69    for (i = 0; i < lpfs->info.num_inputs; i++) {
  70       /*
  71        * Search for each input in current vs output:
  72        */
  73
  74       vs_index = draw_find_shader_output(llvmpipe->draw,
  75                                          lpfs->info.input_semantic_name[i],
  76                                          lpfs->info.input_semantic_index[i]);
  77
  78       /* This can be pre-computed, except for flatshade:
  79        */
  80       inputs[i].usage_mask = lpfs->info.input_usage_mask[i];
  81
  82       switch (lpfs->info.input_interpolate[i]) {
  83       case TGSI_INTERPOLATE_CONSTANT:
  84          inputs[i].interp = LP_INTERP_CONSTANT;
  85          break;
  86       case TGSI_INTERPOLATE_LINEAR:
  87          inputs[i].interp = LP_INTERP_LINEAR;
  88          break;
  89       case TGSI_INTERPOLATE_PERSPECTIVE:
  90          inputs[i].interp = LP_INTERP_PERSPECTIVE;
  91          break;
  92       default:
  93          assert(0);
  94          break;
  95       }
  96
  97       switch (lpfs->info.input_semantic_name[i]) {
  98       case TGSI_SEMANTIC_FACE:
  99          inputs[i].interp = LP_INTERP_FACING;
 100          break;
 101       case TGSI_SEMANTIC_POSITION:
 102          /* Position was already emitted above
 103           */
 104          inputs[i].interp = LP_INTERP_POSITION;
 105          inputs[i].src_index = 0;
 106          continue;
 107       case TGSI_SEMANTIC_COLOR:
 108          /* Colors are linearly inputs[i].interpolated in the fragment shader
 109           * even when flatshading is active.  This just tells the
 110           * setup module to use coefficients with ddx==0 and
 111           * ddy==0.
 112           */
 113          if (llvmpipe->rasterizer->flatshade)
 114             inputs[i].interp = LP_INTERP_CONSTANT;
 115          break;
 116
 117       default:
 118          break;
 119       }
 120
 121       /*
 122        * Emit the requested fs attribute for all but position.
 123        */
 124
 125       inputs[i].src_index = vinfo->num_attribs;
 126       draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_PERSPECTIVE, vs_index);
 127    }
 128    llvmpipe->num_inputs = lpfs->info.num_inputs;
 129
 130    draw_compute_vertex_size(vinfo);
 131
 132    lp_setup_set_vertex_info(llvmpipe->setup, vinfo);
 133
 134    lp_setup_set_fs_inputs(llvmpipe->setup,
 135                           inputs,
 136                           lpfs->info.num_inputs);
 137 }
 138
 139
 140 /**
 141  * Handle state changes.
 142  * Called just prior to drawing anything (pipe::draw_arrays(), etc).
 143  *
 144  * Hopefully this will remain quite simple, otherwise need to pull in
 145  * something like the state tracker mechanism.
 146  */
 147 void llvmpipe_update_derived( struct llvmpipe_context *llvmpipe )
 148 {
 149    struct llvmpipe_screen *lp_screen = llvmpipe_screen(llvmpipe->pipe.screen);
 150
 151    /* Check for updated textures.
 152     */
 153    if (llvmpipe->tex_timestamp != lp_screen->timestamp) {
 154       llvmpipe->tex_timestamp = lp_screen->timestamp;
 155       llvmpipe->dirty |= LP_NEW_SAMPLER_VIEW;
 156    }
 157
 158    if (llvmpipe->dirty & (LP_NEW_RASTERIZER |
 159                           LP_NEW_FS |
 160                           LP_NEW_VS))
 161       compute_vertex_info( llvmpipe );
 162
 163    if (llvmpipe->dirty & (LP_NEW_FS |
 164                           LP_NEW_BLEND |
 165                           LP_NEW_SCISSOR |
 166                           LP_NEW_DEPTH_STENCIL_ALPHA |
 167                           LP_NEW_RASTERIZER |
 168                           LP_NEW_SAMPLER |
 169                           LP_NEW_SAMPLER_VIEW |
 170                           LP_NEW_QUERY))
 171       llvmpipe_update_fs( llvmpipe );
 172
 173    if (llvmpipe->dirty & LP_NEW_BLEND_COLOR)
 174       lp_setup_set_blend_color(llvmpipe->setup,
 175                                &llvmpipe->blend_color);
 176
 177    if (llvmpipe->dirty & LP_NEW_SCISSOR)
 178       lp_setup_set_scissor(llvmpipe->setup, &llvmpipe->scissor);
 179
 180    if (llvmpipe->dirty & LP_NEW_DEPTH_STENCIL_ALPHA) {
 181       lp_setup_set_alpha_ref_value(llvmpipe->setup,
 182                                    llvmpipe->depth_stencil->alpha.ref_value);
 183       lp_setup_set_stencil_ref_values(llvmpipe->setup,
 184                                       llvmpipe->stencil_ref.ref_value);
 185    }
 186
 187    if (llvmpipe->dirty & LP_NEW_CONSTANTS)
 188       lp_setup_set_fs_constants(llvmpipe->setup,
 189                                 llvmpipe->constants[PIPE_SHADER_FRAGMENT]);
 190
 191    if (llvmpipe->dirty & LP_NEW_SAMPLER_VIEW)
 192       lp_setup_set_fragment_sampler_views(llvmpipe->setup,
 193                                           llvmpipe->num_fragment_sampler_views,
 194                                           llvmpipe->fragment_sampler_views);
 195
 196    llvmpipe->dirty = 0;
 197 }
 198